Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/002—Sealings comprising at least two sealings in succession
  • F16J15/004—Sealings comprising at least two sealings in succession forming of recuperation chamber for the leaking fluid
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/002—Sealings comprising at least two sealings in succession
  • F16J15/006—Sealings comprising at least two sealings in succession with division of the pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
  • F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/54—Other sealings for rotating shafts

Definitions

• the invention relates to a sealing arrangement for the sealed passage of rotating shafts through housing bores of housings, comprising at least one lip seal with a sealing lip, which faces the region with normally higher pressure, and a housing having a housing bore for sealed passage for a rotating shaft , with at least one of the axis of the housing bore facing receiving for a sealing arrangement, preferably for at least one lip seal.
• lip seals are used, for example in propeller drive shafts of marine engines, as disclosed in EP 335 368 A1.
• the sealing lip faces the region with normally lower pressure.
• lip seal are known, for example from DE 40 39 666 Al, which are depressurized at all.
• a pressurizing agent is pressed into the space between the lip seals, but there are no indications regarding the tracking or constant of this pressure, which is also due to the sole orientation of this prior art on leakage problems due to contamination on the lip seals.
• the lip seal closest to the interior of the housing is flushed with very large quantities of pressurizing agent, which hardly flows off throttled into the interior of the housing to remove soiling from the area in front of the lip seal arrangement-provided only as an additional measure.
• mechanical seals are used for large refiner with higher pressures or generally when higher pressure fluctuations occur. Mechanical seals are used. Mechanical seals are very expensive and, due to the hard-hard pairing, are also brittle and can break at high pressure peaks, and the system must then be shut down immediately.
• the object of the present invention was therefore to significantly expand the field of use of sealing arrangements with lip seals and thus to achieve their advantages of higher efficiency, better durability even at pressure peaks and easier installation and easier maintenance even at higher pressures and pressure fluctuations over the sealing arrangement ,
• the sealing arrangement described at the outset according to the invention is characterized in that the lip seal is subjected to a constant pressure on the side facing the region with the higher pressure which is higher than the highest pressure occurring within the housing, and between the latter Area and the housing interior, a flow throttling the outflow gap is provided.
• a constant differential pressure is given in any case on the sealing arrangement, so that leading to leaks pressure fluctuations can not act on the lip seal and thus always maintains its tightness.
• each of the lip seals is applied to the region with normally higher pressure side facing with a constant pressure, the does not exceed a predefinable maximum value, wherein the maximum value at the innermost lip seal is higher than the highest occurring within the housing pressure and the pressure difference of the maximum pressures at each lip seal does not exceed a predetermined value. Therefore, there is always a constant pressure difference at each lip seal of the arrangement, whereby the maximum pressure of each of the lip seals is not exceeded by the cascaded arrangement.
• a lip seal can withstand a constant pressure difference of up to approx.
• the or each lip seal is preferably inserted in a groove-like recess facing the rotating shaft within the housing bore, and guides at least one passage connectable to a pressure source to the region normally higher pressure facing side of one or more of the lip seals.
• a medium preferably at least one medium used in the process
• the constant pressurization of the lip seals is easily accomplished without moving components and thus optimally reliable.
• the pressure buildup then takes place due to the narrow passage between the lip seal and the area with higher pressure or by the pressure drop occurring there.
• An additional advantage is the flushing action in this embodiment, since the introduced medium backwashes the possibly reaching into the gap between the shaft and housing particles back and so protects the seal assembly, the shaft and the housing against wear.
• the pressure build-up on the supplied medium is independent of a special design of the installation space of the sealing arrangement possible, for example, when stuffing boxes or mechanical seals are to be replaced by the inventive arrangement
• a throttle ring is inserted into the recess within the housing bore.
• the throttling ring thus ensures the throttled outflow of the medium from the area between the lip seal and the area with higher pressure and thus for the pressure build-up and the pressurization of the lip seal.
• the throttle ring can be designed independently of the lip seal, can be very soft, and can also be adapted to the chemical conditions in the interior of the material.
• this type of construction is characterized in that at least one passage which can be connected to the pressure source leads to the region between this throttle ring and the lip seal.
• the throttle ring is provided with at least one preferably radial bore, and which can be connected to the pressure source passage is connected by this at least one radial bore in the throttle ring with the area between the throttle ring and lip seal.
• the passage between two lip seals remote from the region of normally higher pressure leads to the outside via which passage is removed from the region with normally higher pressure, escaping medium or even process fluid can be discharged in an ordered manner ,
• the tightness of the sealing arrangement can also be checked and monitored if the passage for removing escaping medium is provided with or connected to a sensor device for this medium.
• the solution to the problem set out above assumes that at least one passage which can be connected to a pressure source leads to the area of the or each receptacle which is closer to the region with normally higher pressure.
• a medium for pressurizing this seal arrangement can be supplied with a pressure adjusted to a constant value in order to ensure the optimum and constant tightness of the arrangement.
• the removal of still exiting via the lip seal medium or process fluid can be carried out secured when emanating from a portion of the normally higher pressure portion of the recording another passage for the discharge of emerging from the region of normally higher pressure medium.
• a sensor device for this medium is provided in the further passage for the removal of leaking medium.
• FIG. 2 is a section through a sealing arrangement according to the invention with two lip seals and a throttle ring
• FIG. 3 shows a further embodiment according to the invention in section, with four lip seals connected in series.
• FIG. 1 shows a section through a housing 1 with a sealing arrangement according to the invention, which sealing arrangement is provided for the sealed passage of the rotating shaft 2 through an opening in the housing 1.
• the sealing arrangement comprises in the illustrated simplest example, a single lip seal 3 with a sealing lip 3a, which faces the region with normally higher pressure.
• the lip seal 3 sits on a projection Ia of the opening of the housing 1 and is pressed by a pressure ring 4 against this projection Ia.
• Projection Ia and the shaft 2 with a small distance surrounding section of the Opening of the housing 1 is a circumferential, groove-like region 5 is formed.
• This area 5 which is located on the side of the lip seal 3, which faces the normally higher pressure, performs a bore 6 in the housing 1, so that the area 5 can be connected to a pressure source.
• This pressurizing medium will preferably be a medium already used in the process or being on the normally higher pressure side.
• the medium fed in via the bore 6 flows through the gap 7 between the housing 1 and the shaft 2 in a strongly throttled manner, so that in the region 5 a higher pressure than the pressure normally prevailing on this side of the lip seal 3 can build up.
• This increased pressure is set by external means to a constant value, which value is in any case higher than the highest occurring within the housing pressure. Since there is constant pressure on the side of the lip seal 3 opposite the region 5, usually the ambient pressure, a constant pressure difference is applied to the lip seal 3, so that it maintains its optimum sealing effect constant in time.
• the lip seal 3 is kept clean by the medium flowing from the lip seal 3 and through the gap 7 and any impurities that have entered the gap 7 are flushed out.
• Fig. 2 a further embodiment of the invention is shown, which is advantageous for higher pressure differences between the two sides of the sealing arrangement.
• Like components as in Fig. 1 are also designated by the same reference numerals.
• a throttle ring 9 is used in this embodiment by way of example. Between the region of the normally higher pressure facing side of the throttle ring 9 and the shaft 2, a very narrow gap 10 is now provided, through which gap 10 via the bore 6 in the housing 1 and at least one preferably radial bore 9a in the throttle ring.
• 9 Medium can be supplied from a pressure source. This medium flows, functionally similar as described above, throttled over the gap 10 so that adjusts before the lip seal 3 a regulated value to a constant value, which is higher than the pressure on the lip seal 3 opposite side of the throttle ring.
• a spacer ring 13 is between the two lip seals 3 and 8 used, which has at least one also preferably radial bore 13a, through which the medium enters the region 12.
• the pressure applied via bores 6 and 11 is matched to one another in such a way that the pressure difference at each lip seal does not exceed a predefinable maximum value, which maximum value is typically approximately 2 bar.
• FIG. 3 A further expanded embodiment of a sealing arrangement according to the invention is shown in FIG. 3.
• four lip seals 3, 8, 14 and 15 are provided, of which the lip seal 3 closest to the region with normally higher pressure rests against a projection of the housing 1 and the remaining seals 8, 14 and 15, separately pressed by spacer rings 13, 16 and 17 thereto.
• Each of the spacer rings 13, 16 and 17 has at least one preferably radial bore 13a, 16a and 17a.
• the bore 19 which is farthest from the area normally higher in pressure, serves to remove medium or another fluid from the region of normally higher pressure via the lip seals 3, 8 and 14 into the region 20 passes in front of the outermost lip seal 15. If a sensor device (not shown) for the medium and / or another process fluid is provided in the bore 19 itself or following this bore 19, a leakage of the sealing arrangement can thus be detected.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Sealing Devices (AREA)
• Sealing With Elastic Sealing Lips (AREA)

Priority Applications (10)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (6)

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Citations (9)

Family Cites Families (19)

• 2006
  • 2006-04-28 AT AT0073406A patent/AT503578B1/de not_active IP Right Cessation
• 2007
  • 2007-03-30 EA EA200870477A patent/EA015280B1/ru not_active IP Right Cessation
  • 2007-03-30 DK DK07723845.9T patent/DK2013519T3/da active
  • 2007-03-30 WO PCT/EP2007/002904 patent/WO2007124830A1/de active Application Filing
  • 2007-03-30 BR BRPI0710953-9A patent/BRPI0710953A2/pt not_active IP Right Cessation
  • 2007-03-30 ES ES07723845T patent/ES2398292T3/es active Active
  • 2007-03-30 EP EP07723845A patent/EP2013519B1/de not_active Not-in-force
  • 2007-03-30 CN CN2007800150717A patent/CN101432554B/zh not_active Expired - Fee Related
  • 2007-03-30 PL PL07723845T patent/PL2013519T3/pl unknown
  • 2007-03-30 US US12/226,757 patent/US8608176B2/en not_active Expired - Fee Related
  • 2007-03-30 CA CA2649344A patent/CA2649344C/en not_active Expired - Fee Related
• 2008
  • 2008-11-07 NO NO20084709A patent/NO20084709L/no not_active Application Discontinuation

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